JP3192215B2 - Clock hands and methods of making them - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a timepiece pointer and a method of manufacturing the same, and more particularly, to a high-quality thin needle and a method of manufacturing the same by face pressing.

[0002]

2. Description of the Related Art A conventional timepiece hand has been manufactured through the steps shown in FIGS. That is, first, the metal strip 2 shown in FIG. 9 is continuously pressed and pressed to form the slits 4 and the strip holes 6 shown in FIG. Next, FIG.
12, the outer shape 8 of the pointer is pulled out, and then the pointer is bent by pressing the press surface as shown in FIG. 12 and FIG. 13 along the line AA in FIG. Thereafter, decorations such as plating were applied to complete the guideline.

[0003]

As shown in FIG. 14, a pointer formed by the above-mentioned conventional manufacturing method has a seat thickness T1 substantially equal to a body thickness T2. Thus, the seat thickness T1
When the body thickness T2 is the same as the body thickness, the surface of the pointer becomes flat, and it is not possible to give a sense of quality.

In general, the seat thickness T1 is reduced to the body thickness T2 by face pressing.
In order to form the pointer so as to be thicker, it is necessary to increase the pressing force when the surface is pressed. However,
If the pressing force is increased in this conventional manufacturing method, there arises a problem that the hole diameter accuracy of the already formed hole is reduced. Therefore, in order to prevent the deformation of the hole, a pin or the like is inserted and the surface is pushed. However, there is a case where the pin is bitten by the inserted pin and the pin cannot be removed.

[0005] Further, as the timepiece becomes thinner, it is required to make the hands thinner. When the hands are made thinner in this way, the hands have no three-dimensional effect. Therefore, attempts have been made to provide a three-dimensional effect by making the upper surface of the hands a curved surface in a rounded shape. However, when the pointer is thin, the amount of material is small, so it is difficult to make it into a round shape. Further, as described above, the pressing force could not be increased by the conventional manufacturing method. Could not. Therefore, conventionally, as shown in the cross-sectional view of FIG. 13, the entire pointer is bent in a mountain shape to give a three-dimensional effect, but there is a problem that the thickness of the pointer is larger than that of the band material.

Further, in order to form a hole in the conventional method, a pilot hole 12 is provided in the band material 10 as shown in FIG. 15, and then, as shown in FIG. As shown in FIG. 17, finishing is performed to adjust the size of the hole diameter. Thereafter, the inner periphery 18 of the lower opening of the hakama 14 was chamfered as shown in FIG. 18 in order to easily attach the movement to the pointer shaft. However, when this chamfering is performed, as shown in FIG. 18, burrs 20 are generated in the holes, which makes mounting on the pointer shaft rather difficult.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a thin and three-dimensional timepiece pointer and a method of manufacturing the same.

[0008]

The timepiece hands of the present invention are:
In a clock hand made of a needle body and a seat and hakama integrally, the clock hand is composed of a needle body and a seat having a three-dimensional appearance formed by face pressing, and a face pressing after the formation of the needle body and the seat. Hakama and Hakama hole formed by processing, and after the formation of the Hakama and Hakama hole, surface pressing for forming a stress layer is performed under the needle body.
It consists of a stress layer surface that regulates warpage that has been applied to the surface, and the seat thickness formed by face pressing is thicker than the needle body, and the inner periphery of the lower surface of the hole formed by face pressing is formed. A watch pointer characterized by having a curved surface.

Further, the method for manufacturing a timepiece hand of the present invention comprises:
In a method of manufacturing a timepiece hand having a needle body and a seat, and a handpiece and a handpiece hole by coining or the like continuously using a metal band material, in the order of the manufacturing process, the band material has a pilot hole, a slit, Forming a through hole in the window, forming a seat having a three-dimensional appearance thicker than the needle body and a needle body by face pressing using a die for the band material,
A step of forming a hook and a hole in the seat by face pressing using a die, and performing a finishing process such as diamond cutting, honing, and polishing on the surface of the timepiece hand having the needle body, the seat, and the hook. A step of forming a stress layer surface for restricting warpage by pressing the lower surface of the needle body and extracting a watch hand from the band material, and plating, printing, painting, etc. of the watch hand. A method for manufacturing a watch hand, comprising a step of performing a decoration process.

[0010]

In the method for manufacturing a timepiece hand according to the present invention, the needle body and the seat are formed by face pressing before forming the handpiece and the handpiece hole. For this reason, even if the pressing force of the face pressing process is increased, it does not affect the accuracy of the hole. Therefore, the needle body of a thin pointer can be made
The seat thickness can be made higher than the body thickness, giving a sense of quality. Further, when forming the hook and the hole by the face pressing, a curved surface can be formed without generating burrs on the inner periphery of the lower opening of the hole and the attachment to the pointer shaft becomes easy.

[0011]

FIG. 1 is a sectional view of a timepiece hand according to an embodiment of the present invention, and FIG. 2 is a sectional view of a needle body thereof.

As shown in FIG. 1, the pointer in the present embodiment has a seat thickness T3 formed to be thicker than the body thickness T4, and the seat 22 has a shape that is raised more than the needle body 24. As shown in FIG. 2, the needle body 24 has an upper surface formed in a round shape having a curved surface.

Further, a curved surface 30 formed by surface pressing is provided on the inner periphery of the lower opening of the hole 28 provided in the hole 29.

The upper surface of the pointer is a molding surface formed by surface pressing, and has a surface based on a curved surface as described above. At this time, a stress layer due to processing strain is formed on the surface layer of the needle body 24, and the needle body 24 becomes a curved convex sleigh. Further, in order to eliminate the projecting undulations of the needle body 24 and to make the needle body 24 a flat surface, a punch of a mold is applied from the lower surface direction of the needle to the lower surface of the needle body 24 when a process of pulling out the needle from the band material 32 described later is performed. The stress layer surface due to the processing strain is formed on the needle member 24 so that the projection of the needle body 24 is eliminated, and the needle member 24 has a flat surface. If the projecting razor is large, the projecting razor is eliminated by punching out the surface with a die using a punch whose surface is roughened by honing or the like or by performing a flat punching process using a die from the lower surface direction of the pointer.

Next, a method for manufacturing the timepiece hands will be described. First, as shown in FIG. 3, a metal strip 32 is pressed to form a pilot hole 34, a slit 36, and a window 38.

Next, as shown in FIG. 4, the strip 32 is sandwiched between the coining punch 42 and the coining die 44.
By pressing the surface with the coining punch 42, the needle body 40 and the seat 47 of the pointer are formed in a round shape as shown in FIG.

After that, by further performing the same surface pressing process, the peeling 46 and the peeling hole 48 as shown in FIG. 6 are formed. At this time, the hole 48 is formed by the straight portion 54 of the pin 52 of the coining die, and the inner periphery of the lower opening of the hole 48 is formed on the curved surface 50 by the curved surface portion 56.

After that, finish processing such as diamond cutting, honing and polishing is performed on the surface of the pointer.

Next, the pointer is pulled out of the strip 32.

After that, the pointer is subjected to decorative processing such as plating, printing, painting and the like to complete it.

In the present embodiment, the needle body 40 and the seat 47 and the hammer 46 and the hammer hole 48 are formed in different steps, but they can be formed simultaneously in the same step. Further, in this embodiment, the pointer is pulled out after the finish processing is performed.
Finishing processing and decoration processing may be performed.

The hole can be formed by face pressing in exactly the same manner as a through hole penetrating the pointer or a blind hole as shown in FIG.

[0023]

According to the present invention, the seat thickness can be increased and the body thickness can be reduced .
Since the stress layer surface is provided on the lower surface of the needle body by the face pressing process for forming, there is no warp, and even a thin pointer can provide a pointer having a three-dimensional feeling and a luxurious feeling.

According to the method for manufacturing a timepiece hand of the present invention,
Before forming Hakama and Hakama hole by face pressing,
Since forming the seat and the needle body by a surface embossing, Haka
The pressing force at the time of face pressing can be increased without deformation of the hole, etc. , whereby the seat thickness can be increased, and the needle body can be made thinner and rounded. . In addition, since a through hole which is a window is formed around a portion serving as a guide of the band material, when the band material is wound in a coil shape in each process, the sled of the portion serving as a guide (in the longitudinal direction of the band material) ) Can be reduced, and in the process of pulling out the pointer, the influence on the pointer due to contact with the material around the pointer (scratch, deformation, etc.) can be reduced.

Further, since the inner periphery of the lower opening of the hole can be formed into a curved surface by surface pressing, it can be easily mounted on the pointer shaft without burrs and without chamfering or deburring. it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a timepiece hand according to an embodiment of the present invention.

FIG. 2 is a sectional view of the timepiece hand shown in FIG. 1;

FIG. 3 is a view showing a state in which a through hole is formed in a band material for manufacturing the timepiece hand shown in FIG. 1;

FIG. 4 is a cross-sectional view showing a state in which surface pressing is performed on the strip shown in FIG. 3;

FIG. 5 is a view showing a band material in which a needle body is formed by performing the face pressing process shown in FIG. 4;

FIG. 6 is a view showing a state in which a strip is formed on the strip shown in FIG. 5;

FIG. 7 is a cross-sectional view showing the pin and the pin in the step of forming the hole shown in FIG. 6;

FIG. 8 is a cross-sectional view showing an example in which a blind hole of a timepiece hand is formed by a blind hole.

FIG. 9 is a view showing a strip in a conventional manufacturing process.

FIG. 10 is a view showing a state in which a strip hole and the like are formed in the strip shown in FIG. 9;

11 is a diagram showing a state in which the outer shape of the hands has been removed from the band shown in FIG. 10;

FIG. 12 is a view showing a pointer extracted from the band shown in FIG. 11;

13 is a sectional view taken along line AA of FIG.

FIG. 14 is a sectional view of a pointer manufactured by a conventional manufacturing method.

FIG. 15 is a cross-sectional view showing a state in which a pilot hole is provided in a strip material when forming a hole by a conventional manufacturing method.

FIG. 16 is a cross-sectional view showing a state in which the strip shown in FIG.

FIG. 17 is a cross-sectional view showing a state in which finishing processing has been performed on the strip hole shown in FIG. 16;

18 is a cross-sectional view showing a state where the inner periphery of the lower opening of the hakama shown in FIG. 17 is chamfered.

[Explanation of symbols]

 22 Seat 24 Needle Body 28 Hakama Hole 29 Hakama 30, 50 Curved Surface 32 Band 34 Pilot Hole 36 Slit 38 Window 40 Needle Body 46 Hakama 47 Seat 48 Hakama Hole

Continuing from the front page (72) Inventor Masaaki Kumasaka 2-25 Kita Industrial Park, Kitakami City, Iwate Prefecture Inside Ageo Precision Co., Ltd. (72) Inventor Yusuke Sugawara 2-25 Kita Industrial Park Kitagami City, Iwate Prefecture Ageo Precision Co., Ltd. Examiner Masao Einaga (56) References JP-A-57-52544 (JP, A) JP-A 63-199084 (JP, U) JP-A 51-103461 (JP, U) (58) Int.Cl. ⁷ , DB name) G04B 19/04 B21D 53/00 G01D 13/22

Claims (3)

(57) [Claims] 1. A watch hand comprising a needle body, a seat, and a hakama integrated with each other, wherein the watch hand comprises a needle body and a seat having a three-dimensional effect formed by a face-pressing process. Hakama and Hakama holes formed by surface pressing after formation, and surface pressing for forming a stress layer after the formation of the Hakama and Hakama holes
And a stress layer surface that regulates warpage formed by applying to the lower surface of the needle body, the seat thickness formed by face pressing is larger than that of the needle body, and the hole of the hole formed by face pressing is formed. A timepiece hand wherein the inner periphery of the lower surface is constituted by a curved surface. Wherein Koinin guidance for a timepiece having a continuously using strip of metal needle body and the seat and the skirt and the skirt hole
In the method of manufacturing by machining, etc., in the order of the manufacturing process , a pilot hole, a slit, a step of forming a through hole of a window, and a seat thickness by surface pressing using a mold for the band. A step of forming a seat and a needle body having a three-dimensional feeling thicker than the needle body, a step of forming a hook and a hole in the seat by face pressing using a mold, and a step of forming the needle body and the seat and the hook Diamond cut on the surface of a watch hand with
A step of performing a finishing process such as honing, polishing, and the like, a step of forming a stress layer surface for regulating a warp by pressing the lower surface of the needle body, and a step of pulling out a watch hand from the band material; A method for producing a timepiece hand, comprising a step of performing a decoration process such as plating, printing, and painting of the hand. 3. The method for manufacturing a watch hand according to claim 2, wherein the hakama hole of the hakama is a blind hole or a through hole made by face pressing using a mold.